View xc6383-series datasheet:

4. DC/DC Converters __________________________________________________________________________________ XC6383 Series　PFM Controlled, Step-up DC/DC Converters (Variable Duty Ratio) DETAILS General Description Features The XC6383 series is a group of PFM controlled step-up Operating (start-up) voltage range: 0.9V ~ 10V DC/DC converters. Unlike conventional PFMs, the XC6383 Output voltage range: 2.0V ~ 7.0V in 0. 1V increments automatically switches duty ratio (55% / 75%) when it senses Highly accurate: Set-up voltage ±2.5% changes in load and can support both large and small cur- Maximum oscillator frequency: 100kHz (±15%) rents. Duty Ratio: 55% / 75% (±5%) The XC6383 series employs CMOS process and laser trim- Both built-in switching transistor and external types are a